Category Archives: local self reliance

AS Arman Oganisian of Stable Markets writes “There are no solutions, only trade-offs.” That is a fundamentally engineering attitude. It is fundamentally about the economics, and, in particular, the dramatic drop in levelized cost of energy for wind and renewables, … Continue reading →

(Updated, 2018-05-02. See below.) I love Sankey diagrams, and have written about them with respect to influence of Big Oil on U.S. climate policy, and in connection with what it takes to power a light bulb, providing a Sankey-based explanation … Continue reading →

“No zoning ordinance or by-law shall prohibit or unreasonably regulate the installation of solar energy systems or the building of structures that facilitate the collection of solar energy, except where necessary to protect the public health, safety or welfare.” That’s … Continue reading →

Updated, 11th January 2018 There’s been a lot written about natural gas, New England, and supposed price spikes due to constraints on pipeline capacity. I’ve had my turn a couple of times here (and here), as a matter of fact … Continue reading →

(Slightly updated 2nd October 2017 to add a link to the Brattle Group’s report on the myth of baseload generation.) Secretary of Energy Rick Perry has recently called for `baseload` coal and nuclear plants which are no longer competitive in … Continue reading →

HOW ON-SITE ENERGY SOLUTIONS CAN HELP SAVE THE GRID RE:THINK ORIGINAL SIEMENS The traditional power grid is under tremendous pressure. In many places, infrastructure needs to be upgraded. Extreme weather and cybersecurity are constant concerns. These challenges threaten entire communities … Continue reading →

Kevin Sullivan decided to access the second stream of income from a large solar PV array on his farmland property to help him keep the property profitable. This is popular enough that it’s gotten a name: dual-use. Having just returned … Continue reading →

Energy and water. Update, 2017-07-19: The Solver Elon Musk at the National Governors Association conference last week: It is possible to supply every electron needed to keep America humming by covering just 100 square miles with solar panels. “The batteries … Continue reading →

… By 2030, the report predicts that oil demand will drop to 70 million barrels per day. The resulting collapse in prices will be catastrophic for the industry, and these effects are likely to be felt as early as 2021. … Continue reading →

This is from a blog post by Professor Lucas Davis at his blog. In addition to the subject, that’s an interesting way of presenting a change over time I’ll need to think about: It seems the model could be used … Continue reading →

I see nearly every week in the comedy called progressive plans for energy sources in the Commonwealth of Massachusetts. Progressives, it seems, eschew cooperation with business and attorneys and, as a result, never get anything respectable done. They are, as … Continue reading →

I have been following, with keen interest, the post and comment thread pertaining to “Democratising science” at the blog I monitor daily, … and Then There’s Physics. I think the core subject being discussed is a little different from my … Continue reading →

I don’t have time to offer much in the way of explanation or comments here, but here’s the status of consumption per day, in Kilowatt-hours. Update: I should have provided some context. (Click on image to see a larger figure, … Continue reading →

Once nice thing about having a net metered solar PV array is that, with a little diligence, you can figure out how much electricity your household is consuming each day, or at finer resolution if you like (*). Below is … Continue reading →

Today. Flyer. Position yourself to ride the Energy Revolution. Adapt to warming due to human-caused climate change in the Northeast U.S. by changing over your heating and cooling sources. Make Money. Increase the value of your home. Move towards your … Continue reading →

Kalman filtering and smoothing; dynamic linear models

I have used dlm almost exclusively, except when extreme efficiency was required. Since Jouni Helske's KFAS was rewritten, though, I'm increasingly drawn to it, because the noise sources it supports are more diverse than dlm's. KFAS uses the notation and approaches of Durbin, Koopman, and Harvey.

``The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil (or at least most of it) in programming.''Professor Donald Knuth, 1974